Malicious PDF — malware analysis report

Static analysis result for SHA-256 412968b94fbd4bfe…

MALICIOUS

PDF

83.3 KB Created: 2021-09-06 19:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: aa41c02dd2ea76b82c5818dbb2da9584 SHA-1: 64cd8e753ad90cf2ff2cccaebc0e76d96a4b3936 SHA-256: 412968b94fbd4bfefaa3eab4f01906cfebff8180bc9d8468cc6e6a649b5119d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were extracted, the structure and URL patterns are indicative of malicious activity designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8190e9f814---16874106226.pdf In PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/e9c4372c5758a772dd8a2fa51a4be8ce/43105765524.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/momumikanafusutedilimu.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610da9ccd1416---17624106973.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/verilavupafajuxuk.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160751b8abd50e---mevagowoboxuxunaxeje.pdfIn PDF document text
    • http://novafish.it/userfiles/files/jumotak.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/65285354358.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/lalunogifo.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/makejumakapepe.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a16f245158b---vupidegututoriboje.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/sogizemipexe.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/88390630630.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1dd2d0020---17384593876.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/41255652962.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c4cbd3b95---bapelar.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/20856473636.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135305239367---64083394889.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/latemebixesi.pdfIn PDF document text
    • http://woykoff.hu/upload/file/xodagekiwunezipodesi.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/0naho6o7qkmll4k7k55247lfpm/5784027955.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/raxigosigelofotu.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/ritaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=free+tracing+worksheets+for+preschoolers+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4B 18020 bytes
SHA-256: b3c73480c900490d56dd1860a2ff166bcba4d7bf354545d10522211b4806f1bb
font_01_sfnt_off00010d96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D96 11056 bytes
SHA-256: c8dd3a19510c8caec5d9d18721ebcf0b2372623be047ea45d7174eb671c4a5c0
font_02_sfnt_off00012720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12720 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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